Bicycle lock



FIG. 1 is a left side elevational view of a bicycle lock showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a front elevational view thereof.

The broken-line disclosure of the cable is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a bicycle lock, as shown and described. 